G4 Quicksilver not recognising second 20" display - Any ideas?

I have just acquired a second 20" Apple Display (plastic version) to run alongside my current 20". Because my G4 has only one ADC connector I have bought a DVI to ADC adaptor to plug into the G4's DVI connector. However when I start up the second screen just isn't recognised.
Does anyone have any idea what the problem might be?
I have checked both monitors separately and they are fine. I have also connected a non-Apple display via the DVI connector and it works fine. Could it be a dud adaptor or have I been the dud and bought the wrong adaptor?
Any help would be really appreciated.
Many thanks
Richard
G4 Quicksilver   Mac OS X (10.4.8)  
G4   Mac OS X (10.4.5)  

Hi Malcom
Thanks for the reply
Yes I've tried swapping the monitors and neither will work through the DVI to ADC adaptor and all the cables are connected. I guess I must have either bought the wrong adaptor or the adpator is broken. Is there anyway you might be able to tell me if I have bought the wrong adaptor?
Thanks
Richard

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